# HLS manifest tag handling
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This section describes how AWS Elemental MediaTailor manages tags in the personalized output manifest.

## EXT-X-CUE tags
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MediaTailor replaces `EXT-X-CUE-OUT`, `EXT-X-CUE-OUT-CONT`, and `EXT-X-CUE-IN` tags in the input manifest with `EXT-X-DISCONTINUITY` tags in the output manifest. The `DISCONTINUITY` tags mark the following boundaries:
+ Where the main content transitions to an ad
+ Where one ad transitions to another ad
+ Where an ad transitions back to the main content

## EXT-X-DATERANGE tags
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MediaTailor passes through `EXT-X-DATERANGE` tags from the input manifest to the output manifest. MediaTailor also inserts `EXT-X-DISCONTINUITY` tags that correspond to the `DATERANGE` tags. The `DISCONTINUITY` tags mark the following boundaries:
+ Where the main content transitions to an ad
+ Where one ad transitions to another ad
+ Where an ad transitions back to the main content

## EXT-X-KEY tags
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MediaTailor passes through `EXT-X-KEY` tags from the input manifest. These tags indicate that the main content is encrypted. Since ads aren't encrypted, MediaTailor inserts `EXT-X-KEY:METHOD=NONE` at the start of an ad avail. When playback returns to the main content, MediaTailor re-enables encryption by inserting the `EXT-X-KEY` tag with the `METHOD` value defined as the encryption type.

## Unrecognized tags
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MediaTailor passes through all unknown and custom tags from the input manifest to the output manifest.