MD5 is only suitable for detecting accidental data corruption and not for data security applications.Strong cryptographic hash algorithms such as SHA256 and SHA512 can be used for both datasecurity and data safety. This makes SHA256 and SHA512 more universally usable – but at theexpense of being more computationally expensive to calculate and somewhat less widely supportedby some tools (esp. SHA512).

The only global mechanism for format typing in current widespread use is the MIME(Multipurpose Internet Mail Extensions) Media Types [5] registry operated by IANA (InternetAssigned Numbers Authority) [11]. However, for many digital repository operations MIMEtyping does not provide sufficient granularity to disambiguate important format distinctions,whether based on versioning or profiling. For example, both a tiled RGB TIFF image usingLZW compression and a striped bi-tonal TIFF image with Group 4 compression are typed withthe same MIME identifier: image/tiff. Similarly, the entire PDF family – PDF 1.0 through 1.4,PDF/X-1 through 3 (ISO 15930), and the proposed PDF/A standard [1] – are all typed with asingle identifier: application/pdf. In both cases, the variant digital objects may undergo differentparallel workflows dependent upon the specifics of their internal structure or semantics. Tofacilitate this, the proposed format registry will allow typing, and unambiguous identification, atarbitrary levels of granularity.

It is important that the registry is able to provide detailed authoritative representation informationabout formats. The MIME registry has varying requirements regarding the level of disclosure ofthe specific internal structure of MIME types. In particular, for registrations made outside of theIETF tree such details are “encouraged but not required” [6]. Additionally, publication of thistechnical information is accomplished through the RFC (Request for Comments) process, whichrelies on discursive text meant for human consumption. The proposed format registry seeks bothto develop an appropriate trust mechanism to encourage the deposit of detailed representationinformation about proprietary formats, and to make such information available in standardizedhuman and machine-readable forms, using controlled vocabularies to the fullest extent possible.

So generally the right thing to do is to delete the target file if the recipe fails after beginning to change the file. make will do this if .DELETE_ON_ERROR appears as a target. This is almost always what you want make to do, but it is not historical practice; so for compatibility, you must explicitly request it.

--keep-incomplete Do not remove incomplete output files by failed jobs. Default: False

The central thesis of this book is that it’s time for memory workers and memory institutions to take back control of envisioning the future of memory from management consultants and tech-sector evangelists.

“Digital documents last forever-or five years, whichever comes first.”