diff --git a/src/app/components/Editor.tsx b/src/app/components/Editor.tsx
index 106bcf48..53d5f34f 100644
--- a/src/app/components/Editor.tsx
+++ b/src/app/components/Editor.tsx
@@ -22,6 +22,7 @@ import mimeTypes from "../contents/mime-types";
 import platforms from "../contents/platforms";
 import PublicCode, {
   defaultItaly,
+  FIELD_MIN_VERSIONS,
   IT_COUNTRY_EXTENSION_VERSION,
   LATEST_VERSION,
   PublicCodeWithDeprecatedFields,
@@ -43,7 +44,7 @@ import {
 import { collectRemovedKeys, getYaml } from "../lib/utils";
 import linter from "../linter";
 import publicCodeAdapter from "../publiccode-adapter";
-import { toSemVerObject } from "../semver";
+import { isVersionAtLeast, toSemVerObject } from "../semver";
 import { validator } from "../validator";
 import EditorAwards from "./EditorAwards";
 import EditorBoolean from "./EditorBoolean";
@@ -227,6 +228,15 @@ export default function Editor() {
   });
   const { getValues, handleSubmit, watch, setValue, reset } = methods;
 
+  // Show a field only if it exists in the declared publiccode.yml version
+  // (e.g. `supports` from 0.7.0, `organisation`/`fundedBy` from 0.5.0).
+  const declaredVersion = watch("publiccodeYmlVersion");
+  const isFieldAvailable = (field: keyof typeof FIELD_MIN_VERSIONS) =>
+    isVersionAtLeast(
+      declaredVersion || LATEST_VERSION,
+      FIELD_MIN_VERSIONS[field],
+    );
+
   const checkPubliccodeYmlVersion = useCallback((publicCode: PublicCode) => {
     const { publiccodeYmlVersion } = publicCode;
     setPubliccodeYmlVersion(publiccodeYmlVersion);
@@ -613,9 +623,11 @@ export default function Editor() {
                 <span>
                   <EditorInput<"isBasedOn"> fieldName="isBasedOn" />
                 </span>
-                <div>
-                  <EditorFundedBy />
-                </div>
+                {isFieldAvailable("fundedBy") && (
+                  <div>
+                    <EditorFundedBy />
+                  </div>
+                )}
                 <span>
                   <EditorInput<"roadmap"> fieldName="roadmap" />
                 </span>
@@ -695,18 +707,20 @@ export default function Editor() {
                   <EditorInput<"logo"> fieldName="logo" />
                 </span>
               </EditorSection>
-              <EditorSupports />
-              <EditorSection title={t("editor.sections.organisation")}>
-                <span>
-                  <EditorInput<"organisation.uri">
-                    fieldName="organisation.uri"
-                    required
-                  />
-                </span>
-                <span>
-                  <EditorInput<"organisation.name"> fieldName="organisation.name" />
-                </span>
-              </EditorSection>
+              {isFieldAvailable("supports") && <EditorSupports />}
+              {isFieldAvailable("organisation") && (
+                <EditorSection title={t("editor.sections.organisation")}>
+                  <span>
+                    <EditorInput<"organisation.uri">
+                      fieldName="organisation.uri"
+                      required
+                    />
+                  </span>
+                  <span>
+                    <EditorInput<"organisation.name"> fieldName="organisation.name" />
+                  </span>
+                </EditorSection>
+              )}
               <EditorDependsOn />
               <EditorSection title={t("editor.sections.localisation")}>
                 <span>
diff --git a/src/app/contents/publiccode.ts b/src/app/contents/publiccode.ts
index a333af8b..b1652383 100644
--- a/src/app/contents/publiccode.ts
+++ b/src/app/contents/publiccode.ts
@@ -7,6 +7,18 @@ import softwareTypes from "./softwareTypes";
 export const LATEST_VERSION = "0.7.0";
 export const IT_COUNTRY_EXTENSION_VERSION = "1.0";
 
+// Minimum publiccode.yml version in which each key exists: with an older
+// declared version the key is neither shown in the editor nor serialized.
+export const FIELD_MIN_VERSIONS = {
+  supports: "0.7.0",
+  organisation: "0.5.0",
+  fundedBy: "0.5.0",
+} as const;
+
+// Since 0.5.0 country section keys (IT:) and ISO 3166-1 alpha-2 codes are
+// uppercase (lowercase deprecated); older versions mandated lowercase.
+export const UPPERCASE_COUNTRY_MIN_VERSION = "0.5.0";
+
 // Known aliases for the `supports` field (publiccode.yml v0.7).
 // The stored value is `alias:<name>`; `text` is the human-readable label.
 // See https://github.com/italia/publiccode-parser-go (supports_id validator).
diff --git a/src/app/country-case.spec.ts b/src/app/country-case.spec.ts
new file mode 100644
index 00000000..ee7993ea
--- /dev/null
+++ b/src/app/country-case.spec.ts
@@ -0,0 +1,55 @@
+import YAML from "yaml";
+import { publicCodeDummyObjectFactory } from "./contents/publiccode";
+import { getYaml, parseYaml } from "./lib/utils";
+
+describe("country section and country codes case by declared version", () => {
+  const withCountryData = (publiccodeYmlVersion: string) => ({
+    ...publicCodeDummyObjectFactory(),
+    publiccodeYmlVersion,
+    intendedAudience: { countries: ["it", "DE"] },
+    it: {
+      countryExtensionVersion: "1.0",
+      riuso: { codiceIPA: "c_h501" },
+    },
+  });
+
+  it("emits uppercase (IT:, ISO codes) from 0.5.0 onwards", () => {
+    const yaml = getYaml(withCountryData("0.7.0") as never) ?? "";
+    const parsed = YAMLparse(yaml);
+
+    expect(parsed.IT).toBeDefined();
+    expect(parsed.it).toBeUndefined();
+    expect(parsed.intendedAudience.countries).toEqual(["IT", "DE"]);
+  });
+
+  it("emits lowercase (it:, ISO codes) for versions before 0.5.0", () => {
+    const yaml = getYaml(withCountryData("0.4.0") as never) ?? "";
+    const parsed = YAMLparse(yaml);
+
+    expect(parsed.it).toBeDefined();
+    expect(parsed.IT).toBeUndefined();
+    expect(parsed.intendedAudience.countries).toEqual(["it", "de"]);
+  });
+
+  it("round-trips an old lowercase file into the internal representation", () => {
+    const imported = parseYaml(`
+publiccodeYmlVersion: "0.4.0"
+it:
+  riuso:
+    codiceIPA: c_h501
+intendedAudience:
+  countries:
+    - it
+`);
+
+    expect(imported?.it?.riuso?.codiceIPA).toBe("c_h501");
+    // internal representation is always uppercase
+    expect(imported?.intendedAudience?.countries).toEqual(["IT"]);
+  });
+});
+
+// Parse raw YAML without the internal-representation normalization done by
+// parseYaml, to assert on the actual serialized key case.
+function YAMLparse(yaml: string) {
+  return YAML.parse(yaml);
+}
diff --git a/src/app/lib/utils.ts b/src/app/lib/utils.ts
index 9863b6a4..5e0f2253 100644
--- a/src/app/lib/utils.ts
+++ b/src/app/lib/utils.ts
@@ -1,51 +1,68 @@
 import { useEffect, useState } from "react";
 import YAML from "yaml";
-import PublicCode from "../contents/publiccode";
+import PublicCode, {
+  LATEST_VERSION,
+  UPPERCASE_COUNTRY_MIN_VERSION,
+} from "../contents/publiccode";
 import linter from "../linter";
+import { isVersionAtLeast } from "../semver";
 
 /**
- * Converts country codes in intendedAudience to uppercase (ISO 3166-1 alpha-2 standard)
+ * Converts country codes in intendedAudience to the case mandated by the
+ * declared publiccode.yml version (uppercase since 0.5.0, lowercase before)
  */
-function convertCountriesToUppercase(
-  intendedAudience?: PublicCode["intendedAudience"]
+function convertCountriesCase(
+  intendedAudience: PublicCode["intendedAudience"],
+  toUppercase: boolean
 ): PublicCode["intendedAudience"] {
   if (!intendedAudience) {
     return intendedAudience;
   }
 
+  const convertCase = (code: unknown) =>
+    typeof code === "string"
+      ? toUppercase
+        ? code.toUpperCase()
+        : code.toLowerCase()
+      : code;
+
   const converted = { ...intendedAudience };
 
   if (Array.isArray(converted.countries)) {
-    converted.countries = converted.countries.map((code) =>
-      typeof code === "string" ? code.toUpperCase() : code
-    );
+    converted.countries = converted.countries.map(convertCase) as string[];
   }
 
   if (Array.isArray(converted.unsupportedCountries)) {
     converted.unsupportedCountries = converted.unsupportedCountries.map(
-      (code) => (typeof code === "string" ? code.toUpperCase() : code)
-    );
+      convertCase
+    ) as string[];
   }
 
   return converted;
 }
 
 /**
- * Converts the data object to use uppercase country section keys (e.g., "it" -> "IT")
- * and uppercase country codes in intendedAudience
+ * Converts the data object to the country-code case mandated by the declared
+ * publiccode.yml version: uppercase section keys (e.g., "it" -> "IT") and
+ * country codes since 0.5.0, lowercase for older versions
  */
 function convertForYamlOutput(data: PublicCode): Record<string, unknown> {
   const linted = linter(data);
   const converted: Record<string, unknown> = { ...linted };
+  const toUppercase = isVersionAtLeast(
+    linted.publiccodeYmlVersion || LATEST_VERSION,
+    UPPERCASE_COUNTRY_MIN_VERSION
+  );
 
-  if ("it" in converted && converted.it) {
+  if ("it" in converted && converted.it && toUppercase) {
     converted.IT = converted.it;
     delete converted.it;
   }
 
   if (linted.intendedAudience) {
-    converted.intendedAudience = convertCountriesToUppercase(
-      linted.intendedAudience
+    converted.intendedAudience = convertCountriesCase(
+      linted.intendedAudience,
+      toUppercase
     );
   }
 
diff --git a/src/app/linter/index.ts b/src/app/linter/index.ts
index 1bff3943..8b8f367c 100644
--- a/src/app/linter/index.ts
+++ b/src/app/linter/index.ts
@@ -13,7 +13,10 @@ import PublicCode, {
   defaultPiattaforme,
   defaultRiuso,
   defaultSupport,
+  FIELD_MIN_VERSIONS,
+  LATEST_VERSION,
 } from "../contents/publiccode";
+import { isVersionAtLeast } from "../semver";
 import { removeEmpty } from "./remove-empty";
 
 function validateCategories(categoriesArray: string[]): string[] {
@@ -85,6 +88,12 @@ export default function linter({
       !dependency.version &&
       dependency.optional === undefined);
 
+  const hasField = (field: keyof typeof FIELD_MIN_VERSIONS) =>
+    isVersionAtLeast(
+      publiccodeYmlVersion || LATEST_VERSION,
+      FIELD_MIN_VERSIONS[field],
+    );
+
   const sortedPC: PublicCode = {
     publiccodeYmlVersion,
     name,
@@ -99,17 +108,21 @@ export default function linter({
     categories: categories
       ? (validateCategories(categories) as (typeof categories)[number][])
       : undefined,
-    organisation,
-    fundedBy: fundedBy
-      ?.filter((fo) => !isEmptyFundingOrg(fo))
-      .map((fo) => sortAs(defaultFundingOrganisation, fo)),
+    organisation: hasField("organisation") ? organisation : undefined,
+    fundedBy: hasField("fundedBy")
+      ? fundedBy
+          ?.filter((fo) => !isEmptyFundingOrg(fo))
+          .map((fo) => sortAs(defaultFundingOrganisation, fo))
+      : undefined,
     usedBy: clone(usedBy),
     roadmap,
     developmentStatus,
     softwareType,
-    supports: supports
-      ?.filter((s) => s?.id != null && s.id.trim() !== "")
-      .map((s) => sortAs(defaultSupport, s)),
+    supports: hasField("supports")
+      ? supports
+          ?.filter((s) => s?.id != null && s.id.trim() !== "")
+          .map((s) => sortAs(defaultSupport, s))
+      : undefined,
     intendedAudience: intendedAudience
       ? sortAs(defaultIntendedAudience, intendedAudience)
       : undefined,
diff --git a/src/app/semver.spec.ts b/src/app/semver.spec.ts
index 7647490c..0c8a9f4b 100644
--- a/src/app/semver.spec.ts
+++ b/src/app/semver.spec.ts
@@ -1,4 +1,4 @@
-import { isMinorThanLatest, toSemVerObject } from "./semver";
+import { isMinorThanLatest, isVersionAtLeast, toSemVerObject } from "./semver";
 
 describe("semver test", () => {
   it("should run", () => {
@@ -40,4 +40,15 @@ describe("semver test", () => {
     expect(actual05).toBeTruthy();
     expect(actual07).toBeFalsy();
   });
+
+  it("isVersionAtLeast compares versions component-wise", () => {
+    expect(isVersionAtLeast("0.7.0", "0.7.0")).toBe(true);
+    expect(isVersionAtLeast("0.7.1", "0.7.0")).toBe(true);
+    expect(isVersionAtLeast("1.0.0", "0.7.0")).toBe(true);
+    expect(isVersionAtLeast("1.0.0", "0.5.0")).toBe(true);
+    expect(isVersionAtLeast("0.7", "0.7.0")).toBe(true);
+    expect(isVersionAtLeast("0.5.0", "0.7.0")).toBe(false);
+    expect(isVersionAtLeast("0.6.9", "0.7.0")).toBe(false);
+    expect(isVersionAtLeast("0.2", "0.5.0")).toBe(false);
+  });
 });
diff --git a/src/app/semver.ts b/src/app/semver.ts
index d35f3f40..a22d4a3c 100644
--- a/src/app/semver.ts
+++ b/src/app/semver.ts
@@ -41,6 +41,19 @@ export function toSemVerObject(versionString: string) {
   } satisfies SemVerObject;
 }
 
+export const isVersionAtLeast = (version: string, min: string) => {
+  const v = toSemVerObject(version);
+  const m = toSemVerObject(min);
+
+  if (+v.major !== +m.major) {
+    return +v.major > +m.major;
+  }
+  if (+v.minor !== +m.minor) {
+    return +v.minor > +m.minor;
+  }
+  return +v.patch >= +m.patch;
+};
+
 export const isMinorThanLatest = (semver: SemVerObject) => {
   const latest = toSemVerObject(LATEST_VERSION);
 
diff --git a/src/app/supports.spec.ts b/src/app/supports.spec.ts
index 7bb929d9..34938dea 100644
--- a/src/app/supports.spec.ts
+++ b/src/app/supports.spec.ts
@@ -58,4 +58,47 @@ supports:
 
     expect(linter(allEmpty).supports).toBeUndefined();
   });
+
+  it("drops `supports` when the declared version is older than 0.7.0", () => {
+    const pc = {
+      ...publicCodeDummyObjectFactory(),
+      publiccodeYmlVersion: "0.5.0",
+      supports: [{ id: "alias:gdpr" }],
+      organisation: { uri: "https://example.org" },
+      fundedBy: [{ name: "ACME" }],
+    };
+
+    const linted = linter(pc as never);
+
+    expect(linted.supports).toBeUndefined();
+    // organisation and fundedBy exist since 0.5.0, so they must survive
+    expect(linted.organisation).toEqual({ uri: "https://example.org" });
+    expect(linted.fundedBy).toEqual([{ name: "ACME", uri: undefined }]);
+  });
+
+  it("drops `organisation` and `fundedBy` when the declared version is older than 0.5.0", () => {
+    const pc = {
+      ...publicCodeDummyObjectFactory(),
+      publiccodeYmlVersion: "0.4.0",
+      supports: [{ id: "alias:gdpr" }],
+      organisation: { uri: "https://example.org" },
+      fundedBy: [{ name: "ACME" }],
+    };
+
+    const linted = linter(pc as never);
+
+    expect(linted.supports).toBeUndefined();
+    expect(linted.organisation).toBeUndefined();
+    expect(linted.fundedBy).toBeUndefined();
+  });
+
+  it("keeps version-gated fields at the exact minimum version", () => {
+    const pc = {
+      ...publicCodeDummyObjectFactory(),
+      publiccodeYmlVersion: "0.7.0",
+      supports: [{ id: "alias:gdpr" }],
+    };
+
+    expect(linter(pc as never).supports).toEqual([{ id: "alias:gdpr" }]);
+  });
 });