The Kosovo eSign system supports PAdES, CAdES, and XAdES signature standards, allowing almost any document type to be signed.
Key constraints include:
- Graphical Signatures: Only PDF signing supports graphical signature visualization on the document.
- Multiple Signatures: Only PDF files support multiple signatures (via Adobe Acrobat). Other formats, such as Microsoft Office files, do not support multiple signatures; a new signature will remove existing ones.
- File Access: Unless the application used (e.g., Adobe Acrobat, MS Office) natively supports visualizing the signed document, the result is an encrypted file. A specialized app is required to extract the original file from the encrypted signed file before it can be opened in its native application.