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| Source | Format | Verification Feature | |--------|--------|----------------------| | | DRM-protected PDF or eBook | Watermarked with purchaser info; includes live customer support | | Amazon Kindle Edition | Proprietary format (not true PDF) | Can be printed with limitations; verified by Amazon’s file integrity | | Teachers Pay Teachers (TpT) | PDF (from select sellers with Co. license) | Verified by TpT’s content review team for copyright compliance | | Rainbow Resource Center | Digital download | Download link is scanned and tested before sale | | Homeschool Buyer’s Co-op | Group purchase PDF | Verified through co-op’s vendor agreement with publisher | However, as more educators shift to digital learning,