When trying to generate and download your PDF proposal or owner's manual, you may come across this error message:
This indicates that one of the uploaded files within the PDF is encrypted. You will need to delete that file from your uploaded files area, at the bottom of the project zone. Then you need to decrypt that file on your computer - please see this link which explains this process.
If you are still struggling to decrypt it after reading that Adobe article, there are various tools online that you can use (pdf decryptors, for e.g.), where you can upload your file, and then download a decrypted version. Simply search on google for an "online pdf file decryptor".
Once the file has been decrypted, re-upload it to OpenSolar within the project zone (ensuring you tag it correctly, e.g. owner's manual or sales proposal) and your PDF proposal should now generate successfully.