A follow-up question for this one: is this the license for AttachmentEditor, and do I understand right that I can't legally improve the code? If I can't, are there any alternatives that either allow all the features I need (both read-and-write and read-only modes and descriptions for the attachments), or is freely upgradable? I searched and didn't find anything else. Writing a new editor from scratch just for few new features would be overkill for my current project, adding few features to existing one would be OK.
I need it for a commercial project; our company already has some licenses for ESRI products (I'm not sure which ones, but I can ask).