Protecting files on public FTP account
I have a public FTP account where people can upload/download files. There are no separate folders, everyone can upload/download in all folders of the account. My question is... is there a way to protect the files so they can't be deleted/overwritten after they have been uploaded? I tried changing permissions/ownership of files but I still can delete the uploaded files. I don't need that the files are protected just when they are uploaded, this could be a daily cronjob that protects the files uploaded in the last 24 hours.
If anyone can give me any tip for this I will be very grateful
Thank you.
