{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-10528753","patent":{"patent_number":"US-10528753","title":"Portable document format file custom field","assignee":null,"inventors":[],"filing_date":"2015-06-26T00:00:00.000Z","publication_date":"2020-01-07T00:00:00.000Z","cpc_codes":["G06F","G06F","G06F","G06F","G06F","G06F","H04L","H04L","G06F","G06F","G06Q"],"num_claims":16,"abstract":"Examples include assembly of a portable document format file including encrypted content, unencrypted content, and/or alternative content. In an example, metadata, data block(s), and a content map are signed and stored in, or assembled into, a custom field or fields of the portable document format file. The metadata, data block(s), and content map are encrypted and assembled into a custom field or fields of the portable document format file with an encrypted key or keys. Unencrypted and/or alternative content may also be stored in the assembled portable document format file."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Portable document format file custom field","description":"Examples include assembly of a portable document format file including encrypted content, unencrypted content, and/or alternative content. In an example, metadata, data block(s), and a content map are","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-10528753","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-10528753","citation_suggestion":"Patentable. \"Portable document format file custom field\" (US-10528753). https://patentable.app/patents/US-10528753","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-10528753","json":"https://patentable.app/api/llm-context/US-10528753","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T02:19:44.279Z"}