The information you're talking about (UID, GID, timestamp, et.c) is stored in the file's inode. In UNIX systems, the inode is created whenever a file is created and it stores meta information about the file. When copying a file from system A to system B, a new file is created at B, thus a new inode is created for it. This inode now contains information about the file at system B, not about the file at system A. Both inodes can be completely different, depending under what user FTP was running, when it was uploaded, etc.
However, the file itself could contain sensitive information (like David Tonhofer mentioned), so make sure there's nothing like that.