CREATOR (character) identifies the software that originally created a FITS file.
The value refers to the software that originally defined the FITS file structure and wrote the contents; it should not be changed if the file is copied largely intact into another file. Use HISTORY keywords to document such travels of the file after it has been created. When appropriate, the value of the CREATOR keyword should identify the specific version of the software that created the FITS file; e.g. 'WRITEFITS V3.2'. The AUTHOR keyword (section 18.104.22.168) has sometimes been misused for this purpose, but AUTHOR is reserved for the human author or compiler of a document.