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In Acrobat Distiller, select Settings > Edit Adobe PDF Settings > Compatibility. Select a compatibility level. In PDF Optimizer, select Advanced > PDF Optimizer > Make Compatible With. Select a compatibility level.

Create PDF Compatible File option should be used if you want the Illustrator file to be compatible with other Adobe applications. It saves a PDF representation of the document in the Illustrator file.

Follow these simple steps to use this feature: Open the PDF document you want to copy text from. Click on the 'Edit' button in the toolbar at the top of the page. Select the 'Copy & Paste Text' option from the dropdown menu. Your cursor will turn into a text selection tool.

On Windows: navigate to the PDF file -> right click on it -> select Open with -> click Choose another app -> Choose Adobe Acrobat Reader DC or Adobe Acrobat DC -> check Always use this app to open . pdf files -> click on the OK button.

Unsupported file type: This is the most common reason you cannot open PDF. Occasionally some files may erroneously have the default application set to Adobe Reader. This problem is usually an inadvertent human error. Outdated Acrobat or Adobe Reader: An outdated Adobe Reader or Acrobat program will throw this error.

When using a Microsoft Office application to generate PDF/A files: Click File > Save as. Select a location to save the file. Click More options... In the Save as type list: list, select PDF. Click Options. Select PDF/A compliant and click OK. Click Save.

Protect PDF from Copying and Editing Go to the "Protect" tab, and click the "Set Password" button. Then select the "Permission Password" option. Uncheck "Enable copying of text, images and other content" and enter your desired password. Once confirmed, click on the "Save" button to apply, and save your PDF file.